Photosensitive resin composition for forming a separator, separator structure made therewith, and display device including the same

Abstract

The present invention provides a photosensitive resin composition for forming a separator, a separator structure for a display device made of the photosensitive resin composition, and a display device including the separator structure, the photosensitive resin composition including an alkali-soluble resin, a polymerizable compound, a photopolymerization initiator, and a solvent, wherein a cured film made of the photosensitive resin composition has a transmittance of less than 5% at a wavelength of 450 nm and a reflectance of 30% or more at a wavelength of 640 nm.

Description

TECHNICAL FIELD

[0001] The present application relates to a photosensitive resin composition for forming a separation membrane, a separation membrane structure manufactured using the same, and a display device including the same. BACKGROUND

[0002] Generally, a display device including a color conversion panel using a blue light source exhibits a light shielding property with respect to blue color used as a light source, and a barrier is formed between each color conversion pixel to prevent color mixing of each color conversion pixel. At this time, due to conversion efficiency of the color conversion pixel, a separation membrane between each color conversion pixel is formed to have a film thickness of about 7 to 15 μm.

[0003] A photosensitive resin composition for a black matrix used in the past has no problem in pattern formation when it is manufactured to have a film thickness of 1 to 1.5 μm as in the past. However, a separation membrane of a color conversion panel should be formed to have a film thickness of 7 to 15 μm. When a separation membrane having a thickness of 7 μm or more is formed using the existing photosensitive resin composition for a black matrix, the transmittance of ultraviolet rays is reduced in an exposure process, and thus the line width of a pattern is greatly changed with development time in a development process. When the line width of a separation membrane between color conversion pixels is increased under the same area, the size of the color conversion pixel is reduced, thereby causing a problem in that the color conversion performance of the color conversion panel is reduced.

[0004] In addition, when a separation membrane for a color conversion panel is manufactured, if the existing photosensitive resin composition for a black matrix is used, it is difficult to recognize an underlying align key when an align mask pattern is used in an exposure process after a coating process, thereby causing a problem in that it is difficult to form a pattern at an accurate position. Furthermore, in a separation membrane formed using the existing photosensitive resin composition for a black matrix, light scattered to the separation membrane among red or green light scattered by quantum dots is absorbed and disappears by the separation membrane, thereby causing a problem in that the luminous efficiency of the color conversion panel is reduced.

[0005] On the other hand, in the related art, a colored pattern using an organic pigment is made to manufacture a color filter. In this case, in order to express various required colors, C.I. Pigment Red and C.I. Pigment Orange are used together for a pattern in which red is desired, and C.I. Pigment Green and C.I. Pigment Yellow are used together for a pattern in which green is desired. Since a color filter coating film is generally made to have a thickness in the range of 2 to 3 μm, the manufacturing technology is different from that of the septum for a color conversion panel made to have a thickness of 7 to 15 μm as described above. In addition, in the optical aspect, the color filter aims to express a specific color in color coordinates, and characteristics such as brightness and contrast are important, in contrast to which the septum for a color conversion panel is related to a display device manufacturing technology in combination with a display including a color conversion panel and a blue light source.

[0006] In relation thereto, Korean Patent Publication No. 10-2007-0094460 aims to provide a photosensitive resin composition for forming a septum having excellent heat-resistant shape stability, but the above problems have not been overcome. SUMMARY

[0007] Technical problem

[0008] An object of the present application is to improve the problems of the above-mentioned related art, and to provide a photosensitive resin composition for forming a septum, which can effectively block blue light and improve color conversion characteristics for red and green light.

[0009] Another object of the present application is to provide a photosensitive resin composition for forming a septum, which makes the line width of a pattern less change with development time in a development process.

[0010] Still another object of the present application is to provide a septum structure manufactured using the photosensitive resin composition for forming a septum and a display device including the same.

[0011] Technical scheme

[0012] The present application provides a photosensitive resin composition for forming a septum, which includes an alkali-soluble resin, a polymerizable compound, a photopolymerization initiator, and a solvent, wherein a cured film manufactured from the photosensitive resin composition has a transmittance of less than 5% for a wavelength of 450 nm and a reflectance of 30% or more for a wavelength of 640 nm when having a thickness of 7 to 15 μm.

[0013] Further, the present application provides a display device including a color conversion panel including the septum structure for a color conversion pixel.

[0014] Further, the present application provides a display device including a color conversion panel including the septum structure for a color conversion pixel.

[0015] Inventive effect

[0016] The cured film made of the photosensitive resin composition for forming a septum of the present application satisfies the characteristics of having less than 5% transmittance for a 450 nm wavelength and more than 30% reflectance for a 640 nm wavelength when having a thickness of 7 μm to 15 μm, thereby being able to improve reflectance of red and green light while effectively blocking blue light, and thus provides an effect of being able to improve color conversion characteristics of a color conversion panel including the cured film.

[0017] Further, the photosensitive resin composition of the present application is able to form a structure in which a pattern line width changes little with development time in a development process, thereby being able to form a color conversion pixel of a constant size, and thus provides an effect of being able to prevent color conversion performance from being reduced due to a decrease in size of the color conversion pixel.

[0018] Further, the septum structure made of the photosensitive resin composition of the present application is able to be effectively applied to a color conversion panel using a blue light source and a display device including the color conversion panel, thereby being able to provide a high-quality display device. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a graph showing a transmittance spectrum of a cured film made of the photosensitive resin compositions according to Example 3, Example 6, and Comparative Example 5 of the present application.

[0020] Figure 2 is a graph showing a reflectance spectrum of a cured film made of the photosensitive resin compositions according to Example 3, Example 6, and Comparative Example 5 of the present application. DETAILED DESCRIPTION

[0021] The present application provides a photosensitive resin composition for forming a septum, a septum structure made of the photosensitive resin composition, and a display device including the septum structure, the photosensitive resin composition for forming a septum including an alkali-soluble resin, a polymerizable compound, a photopolymerization initiator, and a solvent, wherein a cured film made of the photosensitive resin composition has less than 5% transmittance for a 450 nm wavelength and more than 30% reflectance for a 640 nm wavelength when having a thickness of 7 μm to 15 μm.

[0022] When the thickness of the cured film made of the photosensitive resin composition is 7 to 15 μm, the maximum transmittance to 450 nm wavelength can be preferably less than 4%, more preferably less than 3%.

[0023] In addition, when the thickness of the cured film made of the photosensitive resin composition is 7 to 15 μm, the reflectance to 640 nm wavelength can be preferably 33% or more, more preferably 36% or more.

[0024] In addition, when the thickness of the cured film made of the photosensitive resin composition is 7 to 15 μm, the reflectance to 550 nm wavelength can be 30% or more, preferably 35% or more, more preferably 40% or more.

[0025] When the cured film satisfies the specific transmittance and reflectance conditions to the specific wavelengths, the blue light used as a light source at the back can be effectively blocked, and the red and green light can be effectively reflected, so that excellent light blocking properties and color conversion properties can be exhibited in a display device using a blue light source including the cured film as a spacer structure.

[0026] A display device including a color conversion panel realizes an image by converting blue (high energy) light into green (low energy) to red (low energy) light using quantum dots in a color conversion pixel. The spacer structure used at this time has a very important technical purpose in preventing inter-pixel interference of the blue light source used as a light source, thereby preventing color mixing of the blue, green, and red pixels generated in each pixel, and has a technical difference compared to the spacer structure used in a color filter that transmits light of a specific wavelength using a white light source to realize color.

[0027] On the other hand, in a display device including a color conversion panel, the thickness of each color conversion pixel is formed to be about 10 μm in order to increase the light absorbance of the color conversion layer and obtain sufficient light conversion efficiency. Therefore, according to the thickness of the color conversion pixel, it is necessary for the spacer structure of the color conversion panel to be formed to have a thickness of 7 to 15 μm.

[0028] In addition, the separation membrane structure according to the related art is generally formed in black, but when the film thickness is 7 to 15 μm instead of the commonly used 1 to 2 μm, the ultraviolet transmittance is reduced due to the large film thickness in the exposure process, and thus it is not possible to induce photocuring to the deep portion. If photocuring is not formed in the deep portion of the coated film, the line width of the pattern is changed with the change in development time, or in a severe case, the bottom of the pattern is entirely developed, thereby causing a problem of pattern loss. Thus, there is a limitation in using a black photosensitive resin composition such as a photosensitive resin composition for a black matrix of the related art as a material for forming a separation membrane structure.

[0029] The photosensitive resin composition according to the present application can be used for forming a red, yellow, or orange separation membrane structure, and can induce photocuring to the deep portion even when a cured film having a thickness of 7 to 15 μm is formed, and thus has an advantage of being able to provide a separation membrane structure in which the line width of a pattern is less changed with the change in development time. In this case, the line width of the pattern can be formed to be 10 to 50 μm.

[0030] Hereinafter, the present application will be described in detail.

[0031] <Photosensitive resin composition>

[0032] The photosensitive resin composition for forming a separation membrane according to the present application contains an alkali-soluble resin, a polymerizable compound, a photopolymerization initiator, and a solvent, and can further contain at least one selected from a colorant and a scattering particle.

[0033] The photosensitive resin composition according to the present application can be characterized in that it is used for forming a separation membrane of a color conversion panel using a blue light source.

[0034] Alkali-soluble resin

[0035] The alkali-soluble resin has reactivity and alkali solubility under the action of light or heat, and functions as a dispersion medium of the solid content contained in the photosensitive resin composition, and if it functions as a binding resin, a resin known in the art can be used without particular limitation.

[0036] Specifically, the alkali-soluble resin is preferably a copolymer of an unsaturated carboxyl group-containing monomer and another monomer copolymerizable therewith.

[0037] Examples of the unsaturated carboxyl group-containing monomer can include an unsaturated carboxylic acid having one or more carboxyl groups in the molecule, such as an unsaturated monocarboxylic acid, an unsaturated dicarboxylic acid, an unsaturated polycarboxylic acid, and the like.

[0038] Examples of the unsaturated monocarboxylic acid can include acrylic acid, methacrylic acid, crotonic acid, a-chloroallyl acrylate, cinnamic acid, and the like.

[0039] Examples of the unsaturated dicarboxylic acid can include maleic acid, fumaric acid, itaconic acid, citraconic acid, mesaconic acid, and the like.

[0040] The unsaturated polycarboxylic acid can be an anhydride, specific examples of which can include maleic anhydride, itaconic anhydride, and citraconic anhydride, and the like. In addition, the unsaturated polycarboxylic acid can also be a mono(2-methacryloyloxyalkyl) ester thereof, examples of which can include succinic acid mono(2-acryloyloxyethyl) ester, succinic acid mono(2-methacryloyloxyethyl) ester, phthalic acid mono(2-acryloyloxyethyl) ester, phthalic acid mono(2-methacryloyloxyethyl) ester, and the like. The unsaturated polycarboxylic acid can also be a mono(meth)acrylate of a di-terminal dicarboxylic polymer thereof, examples of which can include ω-carboxy poly-caprolactone monoacrylate, ω-carboxy poly-caprolactone monomethacrylate, and the like.

[0041] The unsaturated carboxyl group-containing monomer can be used individually or in combination with two or more, respectively.

[0042] Examples of other monomers copolymerizable with the unsaturated carboxyl group-containing monomer can include: aromatic vinyl compounds such as styrene, α-methylstyrene, o-vinyltoluene, m-vinyltoluene, p-vinyltoluene, p-chlorostyrene, o-methoxystyrene, m-methoxystyrene, p-methoxystyrene, o-vinylbenzyl methyl ether, m-vinylbenzyl methyl ether, p-vinylbenzyl methyl ether, o-vinylbenzyl glycidyl ether, m-vinylbenzyl glycidyl ether, p-vinylbenzyl glycidyl ether, and indene; unsaturated carboxylic acid esters such as methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, n-propyl acrylate, n-propyl methacrylate, isopropyl acrylate, isopropyl methacrylate, n-butyl acrylate, n-butyl methacrylate, isobutyl acrylate, isobutyl methacrylate, sec-butyl acrylate, sec-butyl methacrylate, t-butyl acrylate, t-butyl methacrylate, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl acrylate, 2-hydroxypropyl methacrylate, 3-hydroxypropyl acrylate, 3-hydroxypropyl methacrylate, 2-hydroxybutyl acrylate, 2-hydroxybutyl methacrylate, 3-hydroxybutyl acrylate, 3-hydroxybutyl methacrylate, 4-hydroxybutyl acrylate, 4-hydroxybutyl methacrylate, allyl acrylate, allyl methacrylate, benzyl acrylate, benzyl methacrylate, cyclohexyl acrylate, cyclohexyl methacrylate, phenyl acrylate, phenyl methacrylate, 2-methoxyethyl acrylate, 2-methoxyethyl methacrylate, 2-phenoxyethyl acrylate, 2-phenoxyethyl methacrylate, methoxydiethylene glycol acrylate, methoxydiethylene glycol methacrylate, methoxytriethylene glycol acrylate, methoxytriethylene glycol methacrylate, methoxypropylene glycol acrylate, methoxypropylene glycol methacrylate, methoxydipropylene glycol acrylate, methoxydipropylene glycol methacrylate, isobornyl acrylate, isobornyl methacrylate, dicyclopentadiene acrylate, dicyclopentadiene methacrylate, 2-hydroxy-3-phenoxypropyl acrylate, 2-hydroxy-3-phenoxypropyl methacrylate, glycerol monoacrylate, glycerol monomethacrylate, and the like; unsaturated carboxylic acid aminoalkyl esters such as 2-aminoethyl acrylate, 2-aminoethyl methacrylate, 2-dimethylaminoethyl acrylate, 2-dimethylaminoethyl methacrylate, 2-aminopropyl acrylate, 2-aminopropyl methacrylate, 2-dimethylaminopropyl acrylate, 2-dimethylaminopropyl methacrylate, 3-aminopropyl acrylate, 3-aminopropyl methacrylate, 3-dimethylaminopropyl acrylate, 3-dimethylaminopropyl methacrylate, and the like; unsaturated carboxylic acid glycidyl esters such as glycidyl acrylate, glycidyl methacrylate, and the like; carboxylic acid vinyl esters such as vinyl acetate, vinyl propionate, vinyl butyrate, vinyl benzoate, and the like; unsaturated ethers such as vinyl methyl ether, vinyl ethyl ether, allyl glycidyl ether, and the like;Vinyl cyan compounds such as acrylonitrile, methacrylonitrile, α-chloroacrylonitrile, vinylidene cyanide, and the like; unsaturated amides such as acrylamide, methacrylamide, α-chloroacrylamide, N-2-hydroxyethyl acrylamide, N-2-hydroxyethyl methacrylamide, and the like; unsaturated imides such as maleimide, N-benzylmaleimide, N-phenylmaleimide, N-cyclohexylmaleimide, and the like; aliphatic conjugated dienes such as 1,3-butadiene, isoprene, and chloroprene; and macromonomers having a monoacryloyl group or a monomethacryloyl group at the end of a polymer molecular chain such as polystyrene, polymethyl acrylate, polymethyl methacrylate, poly-n-butyl acrylate, poly-n-butyl methacrylate, polysiloxane, and the like. These monomers can be used individually or in combination of two or more.

[0043] The content of the alkali-soluble resin can be 20 to 70% by weight, preferably 30 to 60% by weight, based on the total weight of the solid components in the photosensitive resin composition. When the content of the alkali-soluble resin is within the range, the solubility in the developer is sufficient to make it easy to form a cured film, and the film reduction of the pixel portion of the exposed portion is prevented at the time of development, thereby improving the omission of the non-exposed portion, and thus the range is preferred.

[0044] In the present application, the total weight of the solid components in the photosensitive resin composition refers to the total weight of the remaining components of the photosensitive resin composition excluding the solvent.

[0045] Polymerizable compound

[0046] The polymerizable compound is a compound that can be polymerized by light and heat, and any known polymerizable compound in the art can be used without particular limitation as long as it is a compound that can be polymerized by light and heat, and specifically, a monofunctional monomer, a bifunctional monomer, a remaining polyfunctional monomer, or the like can be used.

[0047] The kind of the monofunctional monomer is not particularly limited, and examples thereof can include nonyl phenyl carbinol acrylate, 2-hydroxy-3-phenoxypropyl acrylate, 2-ethylhexyl carbinol acrylate, 2-hydroxyethyl acrylate, N-vinylpyrrolidone, and the like.

[0048] The kind of the bifunctional monomer is not particularly limited, and examples thereof can include 1,6-hexanediol di(meth)acrylate, ethylene glycol di(meth)acrylate, neopentyl glycol di(meth)acrylate, triethylene glycol di(meth)acrylate, bis(acryloyloxyethyl) ether of bisphenol A, 3-methylpentanediol di(meth)acrylate, and the like.

[0049] The kind of the polyfunctional monomer is not particularly limited, and examples thereof can include trimethylolpropane tri(meth)acrylate, ethoxylated trimethylolpropane tri(meth)acrylate, propoxylated trimethylolpropane tri(meth)acrylate, pentaerythritol tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, dipentaerythritol tri(meth)acrylate, dipentaerythritol penta(meth)acrylate, ethoxylated dipentaerythritol hexa(meth)acrylate, propoxylated dipentaerythritol hexa(meth)acrylate, dipentaerythritol hexa(meth)acrylate, and the like.

[0050] Commercially available examples of the polymerizable compound include Miramer M600 by Miwon Commercial, but are not limited thereto.

[0051] The content of the polymerizable compound can be 5 to 50% by weight, preferably 10 to 40% by weight, based on the total weight of the solid components in the photosensitive resin composition. When the content of the polymerizable compound is within the range, it is preferable in terms of the strength or smoothness of the pixel portion.

[0052] Photopolymerization initiator

[0053] As the photopolymerization initiator, a photopolymerization initiator known in the art can be selected without particular limitation. For example, acetophenone-based compounds, benzophenone-based compounds, triazine-based compounds, thioxanthone-based compounds, oxime-based compounds, benzoin-based compounds, and biimidazole-based compounds can be used.

[0054] For example, as the oxime-based compound, o-ethoxycarbonyl-a-oximino-1-phenylpropan-1-one can be used, and commercially available products include OXE-01 and OXE-02 by Ciba, but are not limited thereto.

[0055] The photopolymerization initiator can be used alone or in combination with two or more, respectively.

[0056] The content of the photopolymerization initiator can be 0.01 to 10% by weight, preferably 0.01 to 5% by weight, based on the total weight of the solid components in the photosensitive resin composition. When the content of the photopolymerization initiator is within the range, the rate of photopolymerization is appropriate, so that an increase in the total process time and a deterioration in the physical properties of the final cured film due to over-reaction can be prevented, and thus the range is preferable.

[0057] In addition to the photopolymerization initiator, the photosensitive resin composition according to the present application can further include a photopolymerization initiator aid. When the photopolymerization initiator aid is used together with the photopolymerization initiator, the photosensitive resin composition becomes more sensitive, so that productivity can be improved, and thus it is preferable to use them together.

[0058] As the photopolymerization initiation aid, which is a compound used for promoting polymerization of the polymerizable compound by the photopolymerization initiator, at least one compound selected from the group consisting of an amine and a carboxylic acid compound can be preferably used.

[0059] When the photopolymerization initiation aid is contained, the content thereof can be usually greater than 0 mole and 10 moles or less, preferably 0.01 moles to 5 moles, per 1 mole of the photopolymerization initiator. When the content of the photopolymerization initiation aid is within the range, the photopolymerization efficiency can be improved, and thus an effect of improving the productivity can be expected, and thus the range is preferred.

[0060] Solvent

[0061] As the solvent, an organic solvent known in the art can be used without particular limitation.

[0062] Specific examples of the solvent can include: glycol monoalkyl ether classes such as ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, ethylene glycol monobutyl ether, and the like; diethylene glycol dialkyl ether classes such as diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol dipropyl ether, and diethylene glycol dibutyl ether, and the like; glycol alkyl ether acetate classes such as methyl cellosolve acetate and ethyl cellosolve acetate, and the like; alkylene glycol alkyl ether acetate classes such as propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, propylene glycol monopropyl ether acetate, methoxybutyl acetate, and methoxyamyl acetate, and the like; aromatic hydrocarbons such as benzene, toluene, xylene, and mesitylene, and the like; ketones such as methyl ethyl ketone, acetone, methyl amyl ketone, methyl isobutyl ketone, cyclohexanone, and the like; alcohols such as ethanol, propanol, butanol, hexanol, cyclohexanol, ethylene glycol, glycerol, and the like; esters such as ethyl 3-ethoxypropionate, methyl 3-methoxypropionate, and the like; and cyclic esters such as γ-butyrolactone, and the like.

[0063] The solvent can be preferably used with a boiling point of 100°C to 200°C from the viewpoints of applicability and dryability, can be more preferably used with alkylene glycol alkyl ether acetate classes, ketones, esters such as ethyl 3-ethoxypropionate or methyl 3-methoxypropionate, and can be further more preferably used with propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, cyclohexanone, ethyl 3-ethoxypropionate, methyl 3-methoxypropionate, and the like.

[0064] The solvent can be used individually or in combination with two or more kinds, respectively.

[0065] The content of the solvent can be 60 to 90% by weight, preferably 70 to 85% by weight, based on the total weight of the photosensitive resin composition. When the content of the solvent is within the content range, if coating is performed using a coating device such as a roll coater, a spin coater, a slit coater, a slit applicator (sometimes also referred to as a die coater), a spray coater, and the like, an effect of improving the coatability is provided, and thus the range is preferred.

[0066] coloring agent

[0067] The photosensitive resin composition according to the present application can include a coloring agent.

[0068] The coloring agent preferably includes at least one selected from the group consisting of C.I. Pigment Red, C.I. Pigment Yellow, and C.I. Pigment Orange, whereby the photosensitive resin composition according to the present application is capable of forming a red, yellow, or orange color type of separator structure. The red, yellow, or orange color type of separator structure thus formed is capable of absorbing blue color type light and reflecting red and / or green color type light. Accordingly, it is possible to prevent the mixing of blue color light and to improve the light emitting properties of red and / or green color type in a display device using a blue color light source.

[0069] Preferably, the C.I. Pigment Red can be at least one selected from diketopyrrolopyrroles, anthraquinones, perylenes, and azos, and the C.I. Pigment Yellow can be at least one selected from anthraquinones, isoindolinones, and azos, and the C.I. Pigment Orange can be at least one selected from quinophthalones, isoindolinones, and diketopyrrolopyrroles.

[0070] More preferably, the C.I. Pigment Red can be at least one selected from the group consisting of C.I. Pigment Red 9, 81, 97, 105, 122, 123, 144, 149, 150, 155, 166, 168, 171, 175, 176, 177, 179, 180, 185, 192, 202, 208, 209, 214, 215, 216, 220, 222, 224, 242, 254, 255, 264, 269, 270, and 272,

[0071] The C.I. Pigment Yellow can be at least one selected from the group consisting of C.I. Pigment Yellow 11, 13, 20, 24, 31, 53, 83, 86, 93, 94, 95, 99, 108, 109, 110, 117, 125, 128, 129, 138, 139, 147, 148, 150, 151, 154, 155, 166, 167, 173, 180, 185, and 199,

[0072] The C.I. Pigment Orange can be at least one selected from the group consisting of C.I. Pigment Orange 13, 15, 31, 36, 38, 40, 42, 43, 51, 55, 59, 61, 64, 65, and 71.

[0073] Most preferably, the C.I. Pigment Red can be at least one selected from the group consisting of C.I. Pigment Red 177, 179, 254, 264 and 269, the C.I. Pigment Yellow can be at least one selected from the group consisting of C.I. Pigment Yellow 138, 139, 150 and 185, and the C.I. Pigment Orange can be at least one selected from the group consisting of C.I. Pigment Orange 64 and 71.

[0074] Further, the present application has a feature of being able to effectively block blue light even without including a black colorant. Therefore, the colorant of the present application preferably does not include a black colorant. However, if necessary, 10% by weight or less, more preferably 5% by weight or less, based on the total weight of the colorant, can be included. If the content of the black colorant as the colorant is too much, a reverse taper can occur due to insufficient curing in the deep, and a problem of degradation of the light emitting efficiency of the display device due to a decrease in reflectance, and thus the content of the black colorant is not too much.

[0075] Specifically, the black colorant can include black organic / inorganic pigments and dyes such as carbon black, titanium black, aniline black, lactam black, perylene black, and can even be understood to further cover the concept of a combination capable of presenting black by including a plurality of colorants.

[0076] When the photosensitive resin composition for forming a barrier film according to the present application includes a colorant, the content thereof can be 1 to 30% by weight, preferably 1.5 to 25% by weight, based on the total weight of the solid content in the photosensitive resin. When the content of the colorant is within the range, the light blocking properties against blue light can be improved, and the reflectance against red light and / or green light can be improved, thereby improving the light emitting properties of the display device.

[0077] On the other hand, as the pigment, a pigment dispersion liquid in which the particle diameter of the pigment is uniformly dispersed can be used. Examples of a method of uniformly dispersing the particle diameter of the pigment can include a method of performing a dispersion treatment by containing a pigment dispersant, etc., by which a pigment dispersion liquid having a state in which the pigment is uniformly dispersed in a solution can be obtained.

[0078] The addition of the pigment dispersant aims at depolymerization and stability maintenance of the pigment, and a pigment dispersant generally used in the art can be used without limitation, and specific examples of the pigment dispersant can include a surfactant, etc., such as a cationic type, an anionic type, a nonionic type, an amphoteric type, a polyester type, a polyamine type, etc., which can be used alone or in combination with two or more, respectively.

[0079] Further, the pigment dispersant preferably includes an acrylate dispersant including butyl methacrylate (BMA) or N,N-dimethylaminoethyl methacrylate (DMAEMA), and a pigment dispersant of other resin types other than the acrylate dispersant can also be used. The pigment dispersant of the resin type can be used alone or in combination of two or more, and can be used in combination with the acrylate dispersant.

[0080] Scattering particles

[0081] The photosensitive resin composition for forming a separator according to the present application can include scattering particles.

[0082] As the scattering particles, scattering particles well known in the art can be selected without particular limitation. Specifically, the scattering particles can include one or more oxides selected from the group consisting of Li, Be, B, Na, Mg, Al, Si, K, Ca, Sc, V, Cr, Mn, Fe, Ni, Cu, Zn, Ga, Ge, Rb, Sr, Y, Mo, Cs, Ba, La, Hf, W, Tl, Pb, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Ti, Sb, Sn, Zr, Nb, Ce, Ta, In, and combinations thereof. For example, the scattering particles can include at least one selected from the group consisting of AI2O3, SiO2, ZnO, ZrO2, BaTiO3, TiO2, Ta2O5, Ti3O5, ITO, IZO, ATO, ZnO-Al, Nb2O3, SnO, and MgO, and a material surface-treated with a compound having an unsaturated bond such as an acrylate can also be used as needed.

[0083] The scattering particles can use scattering particles that limit the average particle diameter and the content in the entire composition to maximize the emission intensity of the color filter.

[0084] In the present application, the "average particle diameter" can be a number average particle diameter, which can be calculated from an image observed by a field emission scanning electron microscope (FE-SEM) or a transmission electron microscope (TEM), for example. Specifically, a plurality of samples can be extracted from the observed image of the FE-SEM or the TEM, the diameters of the samples are measured, and the arithmetic mean is calculated.

[0085] For example, in one embodiment of the present application, the average particle diameter of the scattering particles can be 30 to 500 nm, preferably 30 to 300 nm. When the average particle diameter of the scattering particles satisfies the range, the scattering effect is improved, and thus the photosensitive resin composition containing the same easily ensures the reflectance to red and / or green light.

[0086] When the photosensitive resin composition for forming a separator according to the present application contains scattering particles, the content thereof can be 0.1 to 50% by weight, preferably 0.5 to 20% by weight, based on the total weight of the solid content in the photosensitive resin composition. When the content of the scattering particles is within the range, it is easy to secure the reflectance to red and / or green light, and it is possible to inhibit the decrease in stability of the composition, and thus the range is preferred.

[0087] Additives

[0088] The photosensitive resin composition of the present application can further contain additives as needed, and the kind of the additives can be determined as needed by the user, and the present application is not particularly limited, and examples thereof can include fillers, other polymers, thermal curing agents, surfactants, adhesion promoters, antioxidants, anticoagulants, dispersants, and the like. These example additives can be used alone or in combination with two or more.

[0089] Specific examples of the other polymers can include: curable resins such as epoxy resins, maleimide resins, and the like; and thermoplastic resins such as polyvinyl alcohol, polyacrylic acid, polyethylene glycol monoalkyl ether, polyfluoroalkyl acrylate, polyester, polyurethane, and the like.

[0090] Examples of the antioxidant can include at least one selected from the group consisting of phosphorus-based antioxidants, sulfur-based antioxidants, and phenolic antioxidants, and in this case, it is possible to inhibit the color change phenomenon that can occur at high temperatures in the process or the yellowing that can be caused by a light source after the display is manufactured. The antioxidant can include at least one selected from the group consisting of phenolic compounds, phosphorus compounds, and sulfur compounds, and they can be used in combination of phenolic-phosphorus compounds, phenolic-sulfur compounds, phosphorus-sulfur compounds, or phenolic-phosphorus-sulfur compounds.

[0091] The content of the antioxidant can be 0.1 to 30% by weight, preferably 0.5 to 20% by weight, based on the total weight of the solid content in the photosensitive resin composition. When the content of the antioxidant is within the range, it is preferred from the viewpoint of solving the problem of the decrease in luminous intensity.

[0092] The addition of the dispersant aims to maintain the dispersion stability of the pigment, and a dispersant generally used in the art can be used without limitation.

[0093] As for the additives for which the content is not exemplified in the above-described additives, a person skilled in the art can appropriately add and use within the range that does not hinder the effects of the present application. For example, the amount of use of the additives can be 0.05 to 10% by weight, preferably 0.1 to 10% by weight, more preferably 0.1 to 5% by weight, based on the total weight of the photosensitive resin composition, but is not limited thereto.

[0094] The photosensitive resin composition of the present application can be prepared by a conventional method known in the art, which is not particularly limited in the present application, for example, can be prepared by the following method.

[0095] The colorant and / or scattering particles are previously mixed with a solvent and dispersed using a bead mill or the like until the colorant has an average particle diameter of 30 to 300 nm. At this time, a dispersant can be further used as needed, and a part or all of the alkali-soluble resin can be incorporated. To the resulting dispersion liquid (hereinafter also referred to as a mill base), the remaining part of the alkali-soluble resin, the polymerizable compound, and the photopolymerization initiator are further added, other additives are added as needed, other solvents are added as needed so that the prescribed concentration is reached, whereby the desired photosensitive resin composition can be obtained.

[0096] <Separator structure and display device>

[0097] The present application provides a separator structure made of the above-mentioned photosensitive resin composition and a display device comprising the same.

[0098] In a display device including a color conversion panel, colors are formed by driving each pixel, and thus a separator structure capable of distinguishing each pixel from each other is required. A display device including a separator structure for a color conversion panel formed using the photosensitive resin composition of the present application can prevent color mixing between pixels, is advantageous in forming a fine pattern, and makes it possible to manufacture a separator in which the line width changes less with the development time in a development process. When the line width of the separator changes less, the advantages of being able to ensure sufficient space and to realize a high-quality image are available for a color conversion pixel.

[0099] The display device can include a liquid crystal display device, an organic light emitting diode, a flexible display, etc., but is not limited thereto, and all display devices known in the art that can be applied can be used as examples.

[0100] The separator structure including a color conversion panel can be manufactured by coating the aforementioned photosensitive resin composition of the present application on a substrate and performing photocuring and development to form a cured film.

[0101] First, after coating the photosensitive resin composition on a substrate, the volatile components such as a solvent are removed by drying by heating, whereby a smooth coating film is obtained.

[0102] The coating method can be performed, for example, by a spin coating method, a flow coating method, a roll coating method, a slit spin coating method, or a slit coating method. After the application, the coating film is dried (pre-baked) by heating or dried under reduced pressure and then heated to volatilize the volatile components such as solvents. The heating temperature is usually 70 to 150°C, and preferably 80 to 130°C. The thickness of the coating film after the heating and drying is usually about 7 to 15 μm. The coating film obtained in this manner is irradiated with ultraviolet rays through a mask for forming a desired pattern. At this time, a device such as a mask aligner or a stepper is preferably used to uniformly irradiate parallel rays to the entire exposure portion and accurately align the mask and the substrate. When the ultraviolet rays are irradiated, the photopolymerization initiator generates radicals at the portion irradiated with the ultraviolet rays, and the radicals are photo-cured by reacting with the polymerizable compound.

[0103] As the ultraviolet rays, g-line (wavelength: 436 nm), h-line, i-line (wavelength: 365 nm), or the like can be used. The irradiation amount of the ultraviolet rays can be appropriately selected as needed, but the present application is not limited thereto. When the non-exposed portion is dissolved by contacting the coating film that has been photo-cured with a developing solution to perform development, a desired pattern shape can be obtained.

[0104] The pattern shape thus obtained can be made firm by a post-curing process, and the heating temperature is usually 150 to 250°C, and preferably 180 to 230°C. The heating time is usually 5 to 30 minutes, and preferably 15 to 20 minutes.

[0105] Embodiment of the Invention

[0106] Hereinafter, the present application will be described in more detail based on examples, but the embodiments of the present application disclosed below are merely exemplary, and the scope of the present application is not limited to these embodiments. The scope of the present application is indicated by the claims, and also includes all modifications within the meaning and range equivalent to the content recited in the claims. Furthermore, in the following examples and comparative examples, "%" and "parts" indicating the content are based on mass, unless otherwise specified.

[0107] <Example>

[0108] Synthesis Example 1: Synthesis of Alkali-Soluble Resin

[0109] A flask equipped with a stirrer, a thermometer, a reflux cooling tube, a dropping funnel, and a nitrogen introduction tube was prepared. On the other hand, a monomer dropping funnel was prepared by charging 15 parts by weight of N-benzylmaleimide, 30 parts by weight of acrylic acid, 50 parts by weight of cyclohexyl methacrylate, 5 parts by weight of methyl methacrylate, 4 parts by weight of t-butylperoxy 2-ethylhexanoate, and 40 parts by weight of propylene glycol monomethyl ether acetate (hereinafter also referred to as PGMEA) and then stirring and mixing, and a chain transfer agent dropping funnel was prepared by charging 6 parts by weight of n-dodecanediol and 24 parts by weight of PGMEA and then stirring and mixing.

[0110] After that, 395 parts by weight of PGMEA was introduced into the flask and the atmosphere in the flask was replaced from air to nitrogen, and then the temperature of the flask was raised to 90°C while stirring. After that, the dropping funnels were started to drop the monomer and the chain transfer agent. The dropping was continued for 2 hours while maintaining 90°C, and after 1 hour, the temperature was raised to 110°C and maintained for 3 hours, and then bubbling was started with a mixed gas of oxygen / nitrogen = 5 / 95 (v / v) by introducing the gas introduction tube.

[0111] After that, 20 parts by weight of glycidyl methacrylate, 0.4 parts by weight of 2,2'-methylenebis(4-methyl-6-t-butylphenol), and 0.8 parts by weight of triethylamine were put into the flask and allowed to react for 6 hours at 110°C, and then an alkali-soluble resin having a weight average molecular weight of 3800 and a solid content-based acid value of 83 mgKOH / g was obtained while cooling to room temperature.

[0112] The weight average molecular weight (Mw) of the alkali-soluble resin was measured by the GPC method, and HLC-8120GPC (manufactured by Tosoh Corporation) was used.

[0113] The measurement conditions were that TSK-GEL G4000HXL and TSK-GEL G2000HXL columns were used in series, and the column temperature was 40°C. Tetrahydrofuran was used as a mobile phase solvent, and the measurement was performed while flowing at a flow rate of 1.0 mL / minute. The concentration of the measurement sample was 0.6% by weight, the injection amount was 50 μl, and analysis was performed using an RI detector. TSK STANDARD POLYSTYRENE F-40, F-4, F-1, A-2500, and A-500 (manufactured by Tosoh Corporation) were used as standard substances for calibration, and the weight average molecular weight of the alkali-soluble resin obtained under the above conditions was measured.

[0114] Examples 1 to 11 and Comparative Examples 1 to 7: Preparation of photosensitive resin composition

[0115] A photosensitive resin composition of Examples 1 to 11 and Comparative Examples 1 to 7 was prepared according to the composition and content of Table 1 below.

[0116] [Table 1]

[0117]

[0118]

[0119] - R177: C.I. Pigment Red 177

[0120] - R179: C.I. Pigment Red 179

[0121] - R254: C.I. Pigment Red 254

[0122] - R264: C.I. Pigment Red 264

[0123] - R269: C.I. Pigment Red 269

[0124] - Y138: C.I. Pigment Yellow 138

[0125] - Y139: C.I. Pigment Yellow 139

[0126] - Y150: C.I. Pigment Yellow 150

[0127] - Y185: C.I. Pigment Yellow 185

[0128] - O64: C.I. Pigment Orange 64

[0129] - O71: C.I. Pigment Orange 71

[0130] - B7: C.I. Black Pigment 7

[0131] - OB: Organic black pigment

[0132] - G36: C.I. Pigment Green 36

[0133] - B15:6: C.I. Pigment Blue 15:6

[0134] - Scattering particles: TiO2

[0135] - Alkali-soluble resin: Alkali-soluble resin according to Synthesis Example 1

[0136] - Photopolymerizable compound: Dipentaerythritol hexaacrylate (Kayarad DPHA, manufactured by Nippon Chemicals)

[0137] - Photopolymerization initiator: Irgacure OXE-02 (manufactured by Basf Corporation)

[0138] - dispersant: DISPERBYK-110 (manufactured by BYK Co.)

[0139] - solvent: propylene glycol monomethyl ether acetate (PGMEA)

[0140] Experimental Examples

[0141] (1) Production of a membrane pattern cured film

[0142] A 5 cm x 5 cm glass substrate (Corning Co.) was washed with a neutral detergent and water, and then dried. Each of the photosensitive resin compositions according to Examples 1 to 11 and Comparative Examples 1 to 7 was spin-coated on the glass substrate so that the final film thickness was 10 μm, and pre-baking was performed at 100°C, and the solvent was removed by drying for 2 minutes. Thereafter, exposure was performed using a mask including a line / space pattern of 1 to 100 μm or a 40 mm x 40 mm pattern at an exposure amount of 50 mJ / cm 2 , and the non-exposed portion was removed using an aqueous alkali solution. Then, the produced cured film was baked at 230°C for 20 minutes, whereby a membrane pattern cured film having a thickness of 10 μm was produced.

[0143] (2) Measurement of transmittance and reflectance

[0144] The transmittance and reflectance for different wavelengths were measured using a spectrophotometer (CM-3700d) for the 40 mm x 40 mm pattern cured film produced to have a thickness of 10 μm. O was noted when the transmittance for a 450 nm wavelength was less than 5%, and X was noted when it was 5% or more, O was noted when the reflectance for a 640 nm wavelength was 30% or more, and X was noted when it was less than 30%, and O was noted when the reflectance for a 550 nm wavelength was 30% or more, and X was noted when it was less than 30%, and the results are shown in Table 2, Figure 1 and Figure 2 below.

[0145] (3) Measurement of line width variation

[0146] The line width of the mask pattern was measured using an optical microscope (ECLIPSE LV100POL, Nikon Co.) for the substrate that had undergone a developing time of 80 seconds and the substrate that had undergone a developing time of 160 seconds in the membrane pattern cured film production process of the above (1). The variation in the pattern line width of the substrate that had undergone 80 seconds and the variation in the pattern line width of the substrate that had undergone 160 seconds were measured, and the case where the line width variation was 5.0 μm or more was noted as X. The results are shown in Table 2 below.

[0147] [Table 2]

[0148] 450 nm transmittance 640 nm reflectance 550 nm reflectance Line width variation (pm) Example 1 O O X 1.8 Example 2 O O X 0.3 Example 3 O O X 0.5 Example 4 O O X 3.7 Example 5 O O X 4.1 Example 6 O O O 0.7 Example 7 O O O 3.5 Example 8 O O O 0.4 Example 9 O O O 3.2 Example 10 O O X 0.4 Example 11 O O X 1.4 Comparative Example 1 O X X X Comparative Example 2 O X X X Comparative Example 3 X O X X Comparative Example 4 O X X X Comparative Example 5 O X X X Comparative Example 6 X X X X Comparative Example 7 X X X X

[0149] It was confirmed that the cured film made using the photosensitive resin composition according to Embodiments 1 to 11 had a transmittance of less than 5% for a wavelength of 450 nm, a reflectance of 30% or more for a wavelength of 640 nm, and was excellent in terms of variation in line width of a pattern.

[0150] In particular, it was confirmed that the cured film made using the photosensitive resin composition according to Embodiments 6 to 9 containing a yellow pigment as a colorant had a reflectance of 30% or more for a wavelength of 550 nm.

[0151] In contrast, it was confirmed that the cured film made using the photosensitive resin composition according to Comparative Examples 1 and 2 not containing scattering particles exhibited a transmittance of less than 5% for a wavelength of 450 nm, but a reflectance of less than 30% for a wavelength of 640 nm, and a large variation in line width of a pattern.

[0152] Further, it was confirmed that the cured film made using the photosensitive resin composition according to Comparative Example 3 not containing a colorant exhibited a reflectance of 30% or more for a wavelength of 640 nm, but a transmittance of more than 5% for a wavelength of 450 nm, and a large variation in line width of a pattern.

[0153] In particular, it was confirmed that the cured film made using the photosensitive resin composition according to Comparative Examples 4 and 5 containing only a black colorant which was not a red, yellow or orange colorant as a colorant exhibited a transmittance of less than 5% for a wavelength of 450 nm, but a reflectance of less than 30% for a wavelength of 640 nm despite containing scattering particles, and thus the desired effects of the present application could not be achieved.

Claims

1. A photosensitive resin composition for forming a diaphragm, comprising a colorant, an alkali-soluble resin, a polymerizable compound, a photopolymerization initiator, and a solvent. The colorant contains at least one selected from the group consisting of CI pigment red, CI pigment yellow, and CI pigment orange, and does not contain black or blue pigment. The cured film made from the photosensitive resin composition has a transmittance of less than 5% for a wavelength of 450 nm and a reflectance of more than 30% for a wavelength of 640 nm when it has a thickness of 7 μm to 15 μm.

2. The photosensitive resin composition for forming a diaphragm as claimed in claim 1, further comprising scattering particles.

3. The photosensitive resin composition for forming a diaphragm as claimed in claim 1, wherein the CI pigment red is at least one selected from diketopyrroles, anthraquinones, perylene compounds, and azo compounds.

4. The photosensitive resin composition for forming a diaphragm as claimed in claim 1, wherein the CI pigment yellow is at least one selected from anthraquinones, isoindolinones, and azo compounds.

5. The photosensitive resin composition for forming a diaphragm as claimed in claim 1, wherein the CI pigment orange is at least one selected from quinoline ketones, isoindoline ketones, and diketopyrroles.

6. The photosensitive resin composition for forming a diaphragm as claimed in claim 1, wherein the CI pigment red is at least one selected from the group consisting of CI pigment red 177, CI pigment red 179, CI pigment red 254, CI pigment red 264 and CI pigment red 269, the CI pigment yellow is at least one selected from the group consisting of CI pigment yellow 138, CI pigment yellow 139, CI pigment yellow 150 and CI pigment yellow 185, and the CI pigment orange is at least one selected from the group consisting of CI pigment orange 64 and CI pigment orange 71.

7. The photosensitive resin composition for forming a diaphragm as claimed in claim 2, wherein the scattering particles comprise at least one selected from the group consisting of Al2O3, SiO2, ZnO, ZrO2, BaTiO3, TiO2, Ta2O5, Ti3O5, ITO, IZO, ATO, ZnO-Al, Nb2O3, SnO, and MgO.

8. The photosensitive resin composition for forming a diaphragm as claimed in claim 1, wherein the photosensitive resin composition is used to form a diaphragm for a color conversion panel using a blue light source.

9. The photosensitive resin composition for forming a diaphragm as claimed in claim 1, wherein, based on the total weight of the solid components in the photosensitive resin composition, the content of the alkali-soluble resin is 20% to 70% by weight, the content of the polymerizable compound is 5% to 50% by weight, the content of the photopolymerization initiator is 0.01% to 10% by weight, and the content of the solvent is 60% to 90% by weight of the solvent based on the total weight of the photosensitive resin composition.

10. The photosensitive resin composition for forming a diaphragm as claimed in claim 1, wherein the cured film made from the photosensitive resin composition has a reflectance of more than 30% for a wavelength of 550 nm when having a thickness of 7 μm to 15 μm.

11. A diaphragm structure made of the photosensitive resin composition as described in any one of claims 1 to 10.

12. A display device comprising the diaphragm structure as claimed in claim 11.

Images